Filter the wp_categories_dropdown function by a specific post type.
Fixing Your Deprecated Widget Constructors in WordPress 4.3
A quick update to your code can fix these depreciated widget constructors for WordPress 4.3.
A Better Way to Exclude Pages from Search Results
This little snippet allows you to selectively remove a post type (like pages) from the search results, without inadvertently excluding other post types.
Fixing the wp_editor Error in WordPress 3.9
A little misuse of the TinyMCE editor gone unnoticed until recently, but easily fixed.